You could always transform this from a hardware problem to a software
problem. Take the output of your GPSDO, divide it down to somewhere
inside the audio band, feed it to a spare input on your USB sound
card and have software track this reference and correct the received
signal.
JDB.
--
LART. 250 MIPS under one Watt. Free hardware design files.
http://www.lartmaker.nl/
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